cal poly san luis obispo water conservation best practices uc/csu/ccc sustainability conference ucsb...
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Cal Poly San Luis ObispoWater Conservation Best Practices
UC/CSU/CCC Sustainability Conference
UCSB
June 24-27, 2007
Presented byDennis K. Elliot, PE
Manager of Engineering and Utilities
Cal Poly San Luis ObispoWater Conservation Best Practices
Low Flow Fixture Retrofits of over:
• 200 low flow urinals – 1.5 gpf• 200 low flow toilets – 1.6 gpf• 300 lavatory faucets – 1.0 gpm• 500 shower heads – 2.5 gpm
Cal Poly San Luis ObispoWater Conservation Best Practices
• Total project cost $238,000• Water savings: 39,000 CCF or 29 Million gal per year - 15% of campus total Approx 25,000 gal per fixture• Utility cost savings $240,000 per year @$3/ccf for water, $3/ccf for sewer
02/03 03/04 04/05 05/06
100,000
120,000
140,000
160,000
180,000
200,000
220,000
240,000
260,000
280,000
Cal Poly SLO Annual Potable Water Usage
Total Water Usage, CCF
Cal Poly San Luis ObispoWater Conservation Best Practices
Waterless vs. Ultra Low Flow
Waterless pros & cons:• Zero water usage saves 45,000 gpy• More housekeeping required• Oil seal replacement• Do not pour water down drain!• Cartridge replacement• Supply piping still required by code
Cal Poly San Luis ObispoWater Conservation Best Practices
Waterless vs. Ultra Low Flow
Ultra Low Flow Urinal pros & cons:• 1/8 gpf achieves 90% of waterless savings• Less housekeeping required• No oil seal or cartridge replacement• Works well with sensored flush valves
Cal Poly San Luis ObispoWater Conservation Best Practices
LEED EB Pilot ProjectFaculty Office East Building -
20,000 gsf• Retrofit all fixtures to ULF, sensored• 1/8 gpf Zurn urinals• 0.5 gpm sensored faucets• Will achieve 60% reduction in usage• Qualifies for two LEED points for water efficiency – Credit 3.1 and 3.2• Project cost $15,000• Payback period 8 years
Cal Poly San Luis ObispoWater Conservation Best Practices
Other Conservation Efforts• Irrigation controls• Eliminate “once through” cooling• Public awareness• Metering and monitoring• Management of boilers, cooling towers, water softeners, closed loops
Cal Poly San Luis ObispoWater Conservation Best Practices
Unexpected Consequences:
• Increased concentration of regulated substances in effluent to city.
Cal Poly San Luis ObispoWater Conservation Best Practices
Unexpected Benefits:
• Conservation eliminated need for previously projected future sewer capacity• Resulted in $2M savings to Poly Canyon Village Housing project• Funds returned to project to help pay for additional sustainability features
Cal Poly San Luis ObispoWater Conservation Best Practices
Questions?